elmariachi Call ARP and tell them what you want. Talk to their tech people, have have something to match and the strengh to hold that cap. What is the matter with studs and nuts? A picture of the problem would help. If the bolt head is too wide, is there a washer there? You can mark the bolt and washer, litely grind the washer and bolt head in the location to clear the
oil pan. I would send the pan back to Armando and have it fixed if you already paided for the modification. Tell him it is not right.
Rick L.